San Francisco Central Subway

Keep Tunneling
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Location

San Francisco, California, USA

Scope of Supply

2 x 6.3 m (20.3 ft) EPB TBMs, 2 Continuous Conveyor Systems

Tunnel Length

2 x 2.5 km (1.5 mi)

Ground Condition

Surficial Soils, Poorly Consolidated Silt and Sand Deposits

 

Urban EPB Duo Will Advance
under Downtown San Francisco

  • The two mixed ground EPBs will feature active articulation to drive through curves down to 140m (450 ft) radius
  • The machines will be launched from a small shaft site on a downtown cobblestone street
  • The Central Subway will linkup to Bay Area Rapid Transit (BART) and provide service between the Chinatown and Mission Bay areas